http://www.amazon.com/Networking-Dummies-Doug-Lowe/dp/0470534052 Here you go.. On Aug 10, 2011, at 11:35 PM, Deric Kwok wrote: > Hi > > There is problem in our network. The connection is disappearing. > > ls it about lop ing? > > How can I check it in switch? > > ls spammingtree disable by default? > > Thank you so much >